Square attachment for providing a scriber or a height gauge



July 2, I957 P. ASPERGER A 2,797,491

SQUARE ATTACHMENT FOR PROVIDING A SCRIBER OR A HEIGHT GAUGE Filed 03.10. 1254 IN VEN TOR. Paul flspe rger A T TORNE Y United States Patent C)SQUARE; ATTACHMENT 'FDR- PROVIDING: A: SCRIBERZ OR: A,.HEIGH'.I, "GAUGE1 The present invention relates to layout tools .used formarkingmeasurements upon workpieces and aims to provide, a, novel andimproved, device q n the forrn ;o an attachment to asquare wherebyacombinationscribenand i h ga s pr ed- An object of the. invention is; toprovide, a .rnarker, at-

tachment to asquare whereima,marker-1 blade, is adjust.-

ably clamped to the blade of a squarefor marking. aworkpiece while beingheld in v.properaposition relative-[to said workpiece -by engagement of.the head of, that square with a surfacepn or directly related tosaidworkpiece,

Anotherobjectlof the. invention is to provide, in 3 211001 of, thecharacter.v set forth, a novelt supporting; andadjusting. means for amarker on and relative to .a, squarewherer by th e scale on the blade ofthe square is usedtodetemline the position of the marker.

A further object of the invention is to provide,'in a tool of the,character s et forth, a novel clamping structure for rigidlyholding amarker inadju sted position on a block which in turn is clamped 'to theblade of a square.

It is-also an object-of the-invention -to provide a device of theabovefindicated character, whichissimpleand substantial in construction,inexpensiveito manufacture, and yet. highly efiicientand practical inuse.

These, together. withother auxiliary features andobjectsofther-invention which willllateribecome apparent-as the followingdescription proceeds, are attained by the present invention, a preferredembodiment of which has been illustrated, by way of example only, in theaccompanying drawings, wherein:

Figure 1 is a side elevation showing the attachment on a square and usedas a height gauge;

Figure 2 is a similar view showing the attachment and a square used as ascriber;

Figure 3 is a transverse section taken on line 3-3 of Figure 1;

Figure 4 is a similar sectional view taken on line 4-4 of Figure 1 andlooking upwardly; and

Figure 5 is a vertical setion taken on line 5-5 of Figure 1.

Referring more specifically to the accompanying drawing wherein likenumerals designate similar parts throughout the various views, thenumeral 10 indicates the workpiece; 11, a surface plate upon which theworkpiece 10 rests; and 12, a machinists square having a head 13 andscaled blade 14, the blade 14 also being provided with t ,a longitudinalgroove 15 and the head with a clamping means 16 by which the head isadjustable on and removable from the blade. Because the constructions ofsuch parts of a machinists square are well-known in the art, furtherdetailed illustration and description thereof have been omitted.

The improved attachment to the square 12, which is designated generallyby the numeral 17, consists mainly of a rectangular block or head 18slotted, as at 19 and 20, on sides thereof at right angles to oneanother for receiving and having clamped therein portions of the blade14 of the square 12 and a marker blade 21, re-

Patented. July I 2, 1957 speetively; The slots 19 and.. 2 0 are, of dephs and h- .substant a lyi qual to. he dt s d' h kne ses of; the.. qi1.e. b ade 1 an a k r. b e ,;re pe tive: y d. t, o ngth t end. nti e y ssthe block 18 for permitting longitudinal slidableladjustment of,saidsqareb1ade nd said. ark riblad n .said sl ts and relative to said block.The marker blade-.21. has i s: pposi e ide edges p r ll to. o e, ano r.a d. i f onsiderably g e ter e gth then he block 18 hrough .which.,.i exends-.- Themar r b a 1 has t orward marking. ndt e e ed, at wr glprovide a shar edge22 which is on -the.sameplane-astthat of the surface23 .of the ,bloek thatis slotted ,to receive. said bladsafihus ei her nei eedgeo t m k r 7. ade or. t e/s rface 123 at the slot may beregistered, withthescale on the square blade, in determining the.position of the, edge 22 of the marker fromthe head 13. of-the squares,

A clan ping, element 24 bolted, as atv 25,.t0 the block 18, at thesurface v23,. thereof. engageszone side, edge; .of the marker blade 21andforWsthe otherside. edgetof said marker, bladgin, contact engagement.with the, bottom surface of the slot 20 throughout thelengthof, saidslot for holding saidwblade ,squared, with .said block. t A notch 26inwardly of. the surface 23. and, extending: entirely across lthe,block,18: relieves the block from contacting the-end portionsof the,clampingelement24,.that engages the, mar ker.blade,21, thus assuringthe. application: of pressure by said clamping elementonsaid marker.blade. The 0 ,h6r, end portions, of said clamping element, andnotchareprovided with contacting surface s.27 and 28,

, esnec veb'; hat es ht y d-by r l y c eas:

ing the thick ess ofthe clampingielemen t and the depth of the notch asboth extend outwardly. Between the-locationoftheangled,contactingsurfaces .27. and 28 and the locationof engagementof .the clamping element with the side edge ofthe markerblade, the-bolt.25: is arranged and extends; through an-opening 29 in theclamping ele:ment.beforebeingfthreaded into anopening. 30 in-. the block 18, t Aknurled. head 31 on the bolt ZSengages the outer, surface of. theclamping element, for applying pressure to said clamping element andagainst both the marker blade 21 and the angled contacting surfaces 27and 28. The angled surfaces 27 and 28 maintain the clamping element 24squared with the block 18 and blade 21 both during and after clampingoperation, thus efiecting an eflicient clamping action. Also by slightlyreceiving one end portion of the clamping element 24 between oppositeside walls of the notch 26, the clamping element is held against turningduring clamping operation.

Another clamping element 32 of similar construction to the clampingmeans 16 that adjustably attaches the blade 14 to the head 13 of thesquare 12 is provided for adjustable attachment of the block 18 to theblade 14 of the square, which consists of a draw bolt 33 slidable in anopening 34 in the block and at right angles to the slot 19 and whichengulfs the portion of said slot through which it extends. The draw bolt33 has a knurled nut 35 threaded on one end which bears against a sideof the block 18 and has the other end portion reduced in thickness andprovided with a small lateral tongue 36 for extending to one side of thesquare blade 14 and engaging the tongue into the longitudinal groove 15in said blade. Upon rotation of the nut 35 in a direction tending towithdraw the draw bar 33, the tongue 36 engaging in groove 15 will pullone side edge of the square blade 14 in tight engagement with the bottomsurface of the slot 19, thus securely clamping the block in adjustedposition on the blade 14. Reversing the direction of turning of the nut35 will relieve the clamping action and permit sliding of the block 18to other adjusted positions 3 or removal of the improved attachment 17from the square.

It is clearly apparent that by precision grinding the slots 19 and 20 inthe block 18 to size throughout their lengths and at right angles to oneanother, the blades 14 and 21, when clamped against the bottom surfacesof said slots will be maintained at ninety degrees relative to oneanother independent of adjustments of said blades with respect to theblock and to one another.

In Figure 1, the improved attachment is shown clamped to the blade of asquare in a manner for use as a height gauge whereby a measurement ismade upon the workpiece 10 the proper distance above the face of asurface plate 11 upon which both the workpiece and head of the squarerest. Figure 2 shows adiiferent arrangement of the head 13 of the squarerelative to the improved attachment for use of the tool as a scriber. Inthis case, the head of the square is slid along a surface of theworkpiece 10 while the sharp marking edge 22 of the attachment marks aline on another surface of the work. When used for either of thesepurposes, it will be noted that the marker blade 21 is longitudinallyadjustable to considerable distances with respect to the block 18 whichpermits efiicient use of the tool in laying out workwith irregular sidesor with cavities therein on which markings are to be made.

In view of the foregoing description taken in conjunction with theaccompanying drawings, it is believed that a clear understanding of theconstruction, operation, and advantages of the device will be quiteapparent to those skilled in the art. A more detailed description isaccordingly deemed unnecessary.

While I have herein described a specific form which the invention maytake, it will be understood that changes and modifications may be madewhich still fall within the spirit and scope of the appended claim.

What is claimed is:

An attachment for a square having a blade with graduations thereon and ahead with clamping means by which said blade is adjustable according tosaid graduations to different positions on said head, said attachmentcomprising a substantially rectangular block having a pair of narrow andrelatively deep grooves therein extending inwardly from differentright-angled sides thereof and entirely thereacross and having narrowbottom surfaces at right angles to one another, said grooves beingslightly offset transversely to each other and being open to one anotherwhere they cross, one of said grooves being of a width substantiallyequal to the thickness of the blade of the square and being adapted toreceive a portion of said blade with one of its side edges in engagementwith the narrow bottom surface at the depth of said groove, clampingmeans on said block and engaging said blade so as to frictionally holdsaid side edge of said blade against the bottom surface of said groove,21 marker blade of a thickness substantially equal to the width of theother of said grooves and of a width substantially equal to the depth ofsaid second-mentioned groove and adapted to be partially received insaid second-mentioned groove with one of its side edges in engagementwith the narrow bottom surface at the depth of said second-mentionedgroove, said marker blade having one of its side surfaces in contactingposition with a side surface of the blade of the square at the locationwhere said blades cross and having its side edge opposite to thatengaging the narrow bottom surface at the depth of said second-mentionedgroove aligned with graduations on the blade of the square, and anotherclamping means on said block in engagement with the side edge of saidmarker blade opposite to that in engagement with the bottom surface ofsaid second-mentioned slot so as to hold said marker blade squared withthe blade of the square and in longitudinal adjusted position relativeto said block, said marker blade having a sharp marking edge on one ofits ends and on the same plane as that of the side edge of said markerengaged by said second-mentioned clamping means and aligned with saidgraduations.

References Cited in the tile of this patent UNITED STATES PATENTS579,952 Campbell Apr. 6, 1897 1,179,142 Shaugnessy Apr. 11, 19161,380,744 Simmons June 7, 1921 1,404,425 Bartholdy Jan. 24, 19221,509,703 Bourgeois Sept. 23, 1924 2,345,424 Pfeifer Mar. 28, 1944

